---
title: "Ethernet Shield W5100 for Arduino + microSD card reader ? Okystar OKY2101"
url: "https://maker.wiznet.io/wiz_chandana/resellers/Ethernet-Shield-W5100-for-Arduino-microSD-card-reader-Okystar-OKY2101/"
markdown_url: "https://maker.wiznet.io/wiz_chandana/resellers/Ethernet-Shield-W5100-for-Arduino-microSD-card-reader-Okystar-OKY2101/md"
type: "VAR: Value-Added Reseller Products"
author: "wiz_chandana"
author_url: "https://maker.wiznet.io/wiz_chandana/"
original_author: "wiz_chandana"
published: "2022-06-02"
language: "en"
likes: 0
views: 195
comments: 0
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# Ethernet Shield W5100 for Arduino + microSD card reader ? Okystar OKY2101

> Ethernet Shield W5100 for Arduino + microSD card reader ? Okystar OKY2101

Original author: wiz_chandana

## Article

## **W5100?**

- **All-in-one Ethernet Controller : Hardware TCP/IP, MAC & PHY**

- **Fully hardwired network protocol?**

- **Direct & Indirect Bus and SPI for Host Interface**

- **Stable Data Communication**

The W5100 chip is a Hardwired TCP/IP embedded Ethernet controller that enables easier Internet connection for embedded systems. W5100 suits users in need of stable Internet connectivity best, using a single chip to implement TCP/IP Stack, 10/100 Ethernet MAC and PHY. Hardwired TCP/IP stack supports TCP, UDP, IPv4, ICMP, ARP, IGMP, and PPPoE, …, which has been proven through various applications over many years.?W5100 uses a 16ytes internal buffer as its data communication memory. By using W5100, users can implement the Ethernet application they need by using a simple socket program instead of handling a complex Ethernet Controller.

It is possible to use 4 independent hardware sockets simultaneously. BUS (Direct ?& Indirect) & SPI (Serial Peripheral Interface) are provided for easy integration with the external MCU.

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**Key Features of W5100**

- Hardwired TCP/IP protocols :?TCP, UDP, ICMP, IPv4, ARP, IGMP, PPPoE

- Un-attackable hardware network engine for preventing network attacks such as flooding, spoofing, injection

- Host Interface : Direct/Indirect Bus & Serial Peripheral Interface (SPI MODE 0, 3)

- 4 Independent hardware socket

- Internal 16Kbytes memory for TCP/IP packet processing

- 10BaseT / 100Base TX Ethernet PHY Embedded

- Support Auto-Negotiation (Full & Half Duplex, 10 & 100 Based)

- Support Auto-MDIX

- 3.3V Operation with 5V I/O signal tolerance

- LED outputs (TX, RX, full/half duplex, Collision, link, speed)

- 80LQFP lead-free package (10x10mm)

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Source: https://maker.wiznet.io/wiz_chandana/resellers/Ethernet-Shield-W5100-for-Arduino-microSD-card-reader-Okystar-OKY2101/